Question

Which table shows a proportional relationship between x and y?

A x 2 4 7 12 y 18 28 43 68
C x 3 5 9 12 y 12 14 18 21
B x 2 6 9 12 y 9 27 40.5 54
D x 3 7 9 12 y 13 29 30 34

Answer 1

The ratio of y to x is constant for all values of x in Table B, so it shows a proportional relationship.

For table C:
y/x = 12/3 = 4
y/x = 14/5 = 2.8
y/x = 18/9 = 2
y/x = 21/12 = 1.75